Observation 83142: Agrocybe Fayod

Spores variable, ellipsoid or constricted-ellipsoid or triangular to slightly cordate (!). Golden-tan in KOH.

Ellipsoid spores 15-19 × 9-11 microns, triangular spores ~ 13 microns along the axis of the hilar appendage, 16 microns across the broader distal end.

Basidia apparently predominantly bisporic, with swollen sterigma.

Cheilocystidia rostrate, swollen to nearly globose at base, apical appendage cylindrical, somewhat irregular-sinuate.


Top row: basidia, Middle row: cheilocystidia, Bottom row: variably shaped spores

Proposed Names

28% (1)
Eye3 Eyes3
Recognized by sight
-40% (3)
Based on microscopic features: 2 spored basidia. Cheilocystidia shapes vaguely match. Spore size does not match.
-15% (2)
Used references: Does not key out in http://www.clarku.edu/...
Based on microscopic features: Spores lacking a germ pore

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Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
When you check for pleurocystidia
By: Alan Rockefeller (Alan Rockefeller)
2011-11-24 12:43:29 PST (-0800)

Also check again real quick for a germ pore. Sometimes the germ pore is small and hard to see.

Have you checked the pileipellis yet?

Some answers
By: Christian (Christian Schwarz)
2011-11-24 11:56:09 PST (-0800)

Taste was not sampled, odor was faintly musty, like other Agrocybe, the odd triangular spores were not rare, they were a rather high proportion of the spores I saw. As for the size of the cheilocystidia, I’ll have to measure them and get back to you.

I didn’t see pleurocystidia, but I didn’t specifically look. The spores did not appear to have a germ pore.

By: Alan Rockefeller (Alan Rockefeller)
2011-11-24 11:52:16 PST (-0800)

Did it have pleurocystidia? What was the taste and odor? Did the spores have a germ pore? Were most of them elliptical with a few strange ones, or were most the oddly shaped ones you drew? What size are the cheilocystidia?

A real enigma
By: else
2011-11-24 11:42:38 PST (-0800)

no idea what genus this could be. it certainly does not look like an Agrocybe, but i cannot come up with another name either.
as far as i know, Agrocybe spores have a germ pore.
pleurocystidia should also be present.
do check the pileipellis – that could give us some more information.

Created: 2011-11-24 09:47:11 PST (-0800)
Last modified: 2011-11-25 12:14:58 PST (-0800)
Viewed: 69 times, last viewed: 2017-11-14 20:14:01 PST (-0800)
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